| 1. |
- Moberg, Christina, et al.
(författare)
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De unga gör helt rätt när de stämmer staten
- 2022
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Ingår i: Aftonbladet. - 1103-9000.
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- 1 620 forskare och lärare i forskarvärlden: Vi ställer oss bakom Auroras klimatkrav
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| 2. |
- Beghin, Christian, et al.
(författare)
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Modeling of CLUSTER's electric antennas in space : application to plasma diagnostics
- 2005
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Ingår i: Radio Science. - 0048-6604 .- 1944-799X. ; 40:6, s. RS6008-
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Tidskriftsartikel (refereegranskat)abstract
- [1] The main characteristics of the long-boom electric antennas installed on board the Cluster satellites are derived from finite element modeling in a kinetic and isotropic space plasma, in the frequency range of about 1–100 kHz. The model is based on the surface charge distribution method in quasi-static conditions. The impedances of both types of antenna, i.e., the double-wire and the double-probe, are computed versus the frequency normalized with respect to the local plasma frequency and for several different Debye lengths. Most of the code outputs are checked using analytic estimations for better understanding of the involved physical mechanisms. As a by-product, the effective length of the double-probe antenna and the mutual impedance between the two antennas are computed by the code. It is shown that if it had been possible to implement such measurements on board, one would have been able not only to determine accurately the electric characteristics of the antennas but also to estimate the local plasma parameters. Nevertheless, an interesting feature predicted by the model has been checked recently in orbit by running a special mode of operation for testing the mutual impedance measurement. The preliminary results are globally consistent with the predictions, except that they suggest that our Maxwellian model for the electron distribution should be revised in order to explain the unexpected low-frequency response. After analysis of the electron flux measurements obtained simultaneously, it appears that a rough adjustment of the electron distribution with a two-component distribution allows us to account for the observations.
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| 3. |
- Heith-Stade, David, et al.
(författare)
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Den gudomliga liturgins editionshistoria
- 2014
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Ingår i: Chrysostomosliturgin - förda anteckningar. - 9789197871990 ; , s. 146-151
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Bokkapitel (populärvet., debatt m.m.)
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| 4. |
- Retinò, Alessandro, et al.
(författare)
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In situ evidence of magnetic reconnection in turbulent plasma
- 2007
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Ingår i: Nature Physics. - : Springer Science and Business Media LLC. - 1745-2473 .- 1745-2481. ; 3:4, s. 235-238
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Tidskriftsartikel (refereegranskat)abstract
- Magnetic reconnection is a universal process leading to energy conversion in plasmas. It occurs in the Solar System, in laboratory plasmas and is important in astrophysics . Reconnection has been observed so far only at large-scale boundaries between different plasma environments . It is not known whether reconnection occurs and is important in turbulent plasmas where many small-scale boundaries can form. Solar and laboratory measurements as well as numerical simulations indicate such possibility. Here we report, for the first time, in situ evidence of reconnection in a turbulent plasma. The turbulent environment is the solar wind downstream of the Earths bow shock. We show that reconnection is fast and electromagnetic energy is converted into heating and acceleration of particles. This has significant implications for laboratory and astrophysical plasmas where both turbulence and reconnection should be common.
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| 6. |
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| 7. |
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| 8. |
- Sundkvist, David, et al.
(författare)
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Dissipation in turbulent plasma due to reconnection in thin current sheets
- 2007
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Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 99:2, s. 025004-
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Tidskriftsartikel (refereegranskat)abstract
- We present in situ measurements in a space plasma showing that thin current sheets the size of an ion inertial length exist and are abundant in strong and intermittent plasma turbulence. Many of these current sheets exhibit the microphysical signatures of reconnection. The spatial scale where intermittency occurs corresponds to the observed structures. The reconnecting current sheets represent a type of dissipation mechanism, with observed dissipation rates comparable to or even dominating over collisionless damping rates of waves at ion inertial length scales ( X 100), and can have far reaching implications for small-scale dissipation in all turbulent plasmas.
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